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Attraction of Pest Moths (Lepidoptera: Noctuidae, Crambidae) to Floral Lures on the Island of Hawaii

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Attraction of Pest Moths (Lepidoptera: Noctuidae, Crambidae) to Floral Lures on the Island of Hawaii AProceedingsttrAction of of P theest hMawaiianoths to e fntomologicallorAl lures society (2011) 43:49–58 49 Attraction of Pest Moths (Lepidoptera: Noctuidae, Crambidae) to Floral Lures on the Island of Hawaii Peter Landolt1, Eric Jang2, Lori Carvalho2, and Michael Pogue3 1USDA, ARS, Yakima Agricultural Research Laboratory, 5230 Konnowac Pass Road, Wapato, Washington 98951 USA (corresponding author, [email protected]) 2USDA, ARS, PBARC, 64 Nowelo St., Hilo, Hawaii 96720, USA, [email protected] 3USDA, ARS, Systematic Entomology Laboratory, MRC-108, Smithsonian Institution, Washington DC 20013, USA, [email protected] Abstract. Traps baited with floral chemicals on the island of Hawaii captured several pest moth species. Chrysodeixis eriosoma (Doubleday) (green garden looper), Au- tographa biloba (Doubleday) (bi-lobed looper), and Mythimna unipuncta (Haworth) (true armyworm), all Noctuidae, as well as Hymenia recurvalis (L.) (beet webworm), a Crambidae, were trapped with phenylacetaldehyde (PAA). There was no response by moths to β-myrcene (BM), methyl salicylate (MS), cis jasmone (CJ), methyl-2-methoxy benzoate (MMB), 2-phenylethanol (2PE), or linalool (LIN) when these chemicals were tested singly. When other floral chemicals were presented in traps with PAA, numbers of C. eriosoma captured were increased by BM, MS, 2PE or MMB. Numbers of A. biloba and Peridroma saucia (Hübner) (variegated cutworm) were increased by including BM with PAA in traps. Numbers of M. unipuncta were increased by BM or 2PE, and numbers of H. recurvalis were increased by MMB or LIN, presented with PAA. Both sexes of these five species of moths were trapped with floral lures, most females captured were mated, and many females possessed mature eggs. Key Words: Crambidae, floral chemical, lure, Noctuidae, trap Introduction Flowers of several species of plants are sources of chemical attractants that can be used to trap some pest moths. These flowers include Araujia sericiphera (bladderflower) (Cantelo and Jacobson 1979), Abelia grandiflora (glossy Abelia) (Haynes et al. 1991), Lonicera japonica (Japanese honeysuckle) (Pair and Horvat 1997), Cestrum nocturnum (night-blooming Jessamine) (Heath et al. 1992), Gaura spp (Shaver et al. 1997), Berberis aquifolium (Oregongrape) (Landolt and Smithhisler 2003), Buddleia davidii (butterfly bush) (Guédot et al. 2008), and Cirsium arvense (Canada thistle) (El-Sayed et al. 2008). Pest species of loopers in the noctuid subfamily Plusiinae are noteworthy in their strong attraction to floral compounds from these plants. Floral chemicals have been experimentally demonstrated as attractants for trapping Trichoplusia ni (Hübner ) (cabbage looper) (Landolt et al 2006), Chrysodeixis includens (Walker) (soybean looper) (Meagher 2002; Meagher and Landolt 2008), Autographa californica (Speyer) (alfalfa looper) (Landolt et al. 2001, 2006), Autographa gamma (L.) (silver Y moth) (Molleman et al. 1997; Toth et al. 2010), Anagrapha falcifera (Kirby) (celery looper) (Landolt et al. 2011), and Thysanoplusia orichalcea (F.) (old world soybean looper) (Stringer et al. 2008). Floral chemicals that attract pest Plusiinae include PAA, methyl salicylate (MS), methyl-2-methoxy benzoate (MMB), β-myrcene (BM), cis-jasmone (CJ), 2-phenylethanol (2PE), linalool (LIN), benzaldehyde, and benzyl alcohol (i.e., Cantelo and Jacobson 1979; Haynes et al. 1991; Heath et al. 1992; Landolt et al. 2001, 2006; Meagher and Landolt 2008, 2010; Molleman et al. 1997; Toth et al. 2010). 50 lAndolt et Al. These chemicals, and combinations thereof, are also attractive to several non-pest Plusiinae species such as Macdunnoughia confusa (Stephens) (Toth et al. 2010), and Argyrogramma verruca (F.) and Ctenoplusia oxygramma (Geyer) (Meagher and Landolt 2008), and moths in other noctuid subfamilies and other families (Landolt et al. 2007, 2011; Lopez et al. 2000; Meagher and Landolt 2010; Toth et al. 2010). Plusiinae moth responses to flower chemicals have been demonstrated for a number of North American species, although related moth taxa in other geographic areas are likely to respond similarly to these chemicals. For example, Stringer et al. (2008) demonstrated attraction of T. orichalsea to volatiles of flowers of Canada thistle in New Zealand. Chrysodeixis eriosoma (Doubleday), a plusiine noctuid referred to as the green garden looper, is widely distributed in the Orient (Konenko and Pinratana 2005) and has a broad host plant range, attacking numerous vegetable and forage crops (Holloway 1985). Its distribution includes the Hawaiian Islands, where it is an introduced pest of vegetables (Luther et al. 1996). We took advantage of C. eriosoma occurrence in an agricultural area on the island of Hawaii to determine if it is attracted to floral chemicals that are lures for other pestiferous Plusiinae. We were particularly interested to determine C. eriosoma responses to these chemicals because of the strong attraction to floral chemicals by the closely related C. includens of North and Central America (Meagher 2001; Meagher and Landolt 2008). Additional information was obtained and is here reported on the capture of several other noctuid moths and the beet webworm, Hymenia recurvalis (L.) (Crambidae) in traps baited with floral chemicals. Materials and Methods Four field trapping experiments (referred to as A, B, C, and D) evaluated moth attraction to floral chemicals and their combinations on the island of Hawaii. These experiments compared moths trapped with (A) PAA, BM, and MS, (B) PAA, CJ, and methyl-2-methoxy benzoate (MMB), (C) PAA, 2PE, and LIN, and (D) a range of release rates of the combination of PAA and BM. All experiments were conducted in a vegetable growing region near Waimea, Hawaii. Traps were placed within mixed fields of Brassica oleracea (cabbage), Brassica alboglabra (turnip mustard), Brassica kali (Chinese kale), Raphanus sativa (radish), Lactuca sativa (lettuce), Cucurbita spp. (squash), and Cynara scolymus (artichoke). Universal Moth Traps (UniTraps, AgriSense, PontyPridd, UK) that were used for these experiments consisted of a white bucket covered by a yellow cone and a green lid. A 2.2 cm2 piece of Vaportape® (Hercon Environmental Inc., Emigsville, PA) was placed within the bucket to kill captured insects, and was replaced every 4 weeks. Traps were 10 m apart and were checked twice per week. Lures were 8 ml polypropylene vials (Nalge Nunc, Rochester, NY) with a 3 mm hole in the lid to provide release of volatilized chemicals. For each chemical tested, 4 ml of active ingredient were loaded onto cotton balls in the bottom of a vial as described by Landolt et al. (2001), and the vial was suspended within the inside of the trap bucket. For all four field tests, a randomized complete block design was used, with six block replicates. The first three experiments tested for evidence of moth attraction to each of the tested chemicals, and for interaction between PAA and the other chemicals. Test dates and lure chemicals for each test are provided in Table 1. Test D compared numbers of moths trapped over a range of release rates of PAA + BM. This chemical combination was used in this test because of its overall performance as a lure in test A. For all traps, PAA and BM were each loaded into separate 8 ml polypropylene vials, each at a dose of 4 ml per vial on cotton balls. The release rate was varied by the size of the hole in the lid of the vial. Trapping dates and treatments are provided in Table 1. A subset of female moths captured in test D was dissected to determine their mating status as indicated by the number of spermatophores in the bursa copulatrix, and numbers of eggs present. Moths were AttrAction of Pest Moths to florAl lures 51 scored for their reproductive state as (I) unmated and no mature eggs, (II) mated and with mature eggs, and stage III, mated and no eggs. For tests A, B, and C, trap captures for each PAA+MS PAA+MMB PAA+LIN ------ Treatment 5 Treatment species were analyzed and treatment means were separated by the Mann-Whitney Test (DataMost 1995). For test D, trap catch data were analyzed by a one-way ANOVA testing for effect of vial hole diameter on mean numbers of moths trapped. Within a species, and for female and male H. MS MMB LIN 12.0 mm recurvalis, means were separated using Tukey’s test at p < 0.05. Treatment 4 Treatment Voucher specimens of moth species trapped are deposited in the James Entomological Collection, Washington State University, Pullman, WA. We follow Lafontaine and Schmidt (2010) on the taxonomy of Noctuoidea. PAA+BM PAA+CJ PAA+2PE 6.0 mm Treatment 3 Treatment Results Test A. Numbers of C. eriosoma captured were significantly greater in traps baited with PAA+ BM and PAA + MS, compared to unbaited traps (Table 2). We interpret such responses to be BM CJ 2PE 3.0 mm evidence of attraction to trap lures. Autographa Treatment 2 Treatment biloba (Doubleday) moths were most frequently captured in traps baited with PAA + BM, and numbers of these moths in PAA+BM traps were significantly greater than in unbaited traps. Mythimna unipuncta (Haworth) (true armyworm) PAA PAA PAA 1.5 mm moths were attracted to PAA, and the inclusion Treatment 1 Treatment of BM significantly increased their numbers in traps. Hymenia recurvalis (L.) (beet webworm) moths were attracted to PAA, and inclusion of BM or MS with PAA did not significantly enhance No lure No lure No lure No lure their response over PAA alone (Table 2). The Control numbers of H. recurvalis moths trapped were much higher than the numbers of C. eriosoma or other noctuids captured. Totals of 22 C. eriosoma, 33 M. unipuncta, 20 A. biloba, and 466 female and 655 male H. recurvalis were captured in this test. Test B. Numbers of C. eriosoma trapped were Dates significantly greater in traps baited with PAA compared to unbaited traps (Table 3). Mythimna unipuncta moths were captured in traps baited with 18 March to 14 April 18 March to 14 15 April to 31 May 15 15 April to 31 May 15 3 June to 7 July PAA, but other chemicals tested were not attractive Trap Trap baits for field experiment A, B, C, testing β-myrcene (BM), cis jasmone (CJ), linalool (LIN), methyl-2-methoxy benzoate (MMB), and did not increase M.
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